β‐Diazocarbonyl Compounds: Synthesis and their Rh(II)‐Catalyzed 1,3 C−H Insertions
作者:Liyin Jiang、Zhaofeng Wang、Melanie Armstrong、Marcos G. Suero
DOI:10.1002/anie.202015077
日期:2021.3.8
of ketone silyl enol ethers with diazomethyl‐substituted hypervalent iodine reagents that gives access to unusual β‐diazocarbonyl compounds. The potential of this unexplored class of diazo compounds for the development of new reactions was demonstrated by the discovery of a rare Rh‐catalyzed intramolecular 1,3 C−H carbene insertion that led to complex cyclopropanes with excellent stereocontrol.
α‐Arylation of Carbonyl Compounds through Oxidative C−C Bond Activation
作者:Jing Li、Adriano Bauer、Giovanni Di Mauro、Nuno Maulide
DOI:10.1002/anie.201904899
日期:2019.7.15
A synthetically useful approach for the direct α‐arylation of carbonylcompounds through a novel oxidative C−C bondactivation is reported. This mechanistically unusual process relies on a 1,2‐aryl shift and results in all‐carbon quaternary centers. The transformation displays broad functional‐group tolerance and can in principle also be applied as an asymmetric variant.
A new protocol for the deoxygenation of alcohols and the hydrogenation of alkenes under Brønsted acid catalysis has been developed. The method is based on the use of either a benzyl or isopropyl ether as a tracelesshydrogen‐atom donor, and involves an intramolecular hydride transfer as a key step, which is achieved in a regio‐ and stereoselective manner.